feat: Add path config on Secrets Manager prefix for Keys

[jadiaconu]

Description

Add prefix for AWS Secret Manager + Keys.

Type of Change

• Bugfix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[Copilot]

Pull Request Overview

This PR adds configurable path prefix support for AWS Secrets Manager across both credential and key storage services. The change enables customization of the secrets path hierarchy in AWS Secrets Manager.

• Changed secretsPrefix parameter from pointer to string type for consistency
• Added secretsPrefix parameter to NewAwsSmKeyStore function
• Updated function calls to pass the secrets prefix configuration

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
backend/internal/core/idp/credential_aws_sm.go	Changed secretsPrefix from pointer to string type and updated usage
backend/internal/core/identity/key.go	Added secretsPrefix parameter to NewAwsSmKeyStore function
backend/cmd/bff/main.go	Updated function calls to pass secretsPrefix without pointer reference

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